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Cognitive radio (CR) was proposed in wireless communications to improve spectral efficiency based on the concept of opportunistic spectrum access. Because orthogonal frequency division multiplexing (OFDM) has become the major access technique, an efficient spectrum sensing technique targeted at OFDM-based signals is one of the primary requirements of CR networks. To reduce computational complexity,...
FFT is a crucial and necessary design entity lor any current communication applications, especially for OFDM systems. As compared with conventional design approach, which can support only one-radix processing kernel of single-path delay feedback (SDF) FFT, we propose a reconfigurable processing kernel design for multiple-radix types of SDF FFT. In implementation, this kernel hardware engine is reconfigurable...
In this paper, a novel multicarrier waveform called filter bank OFDM (FB-OFDM) is proposed for use in 5G. FB-OFDM adopts complex modulation and filtering on subcarrier level. It is compatible to CP-OFDM utilized by LTE and its transceiver can be implemented by simple polyphase filter. Moreover, FB-OFDM system can support asynchrony between subcarriers and choose pulse function adaptively under different...
A novel highly-efficient multi-band multi-mode all-digital quadrature transmitter is presented. In the transmitter, a switching-mode power amplifier (PA), also referred to as digital power amplifier (DPA), which consists of an in-phase PA (I-PA) and a quadrature PA (Q-PA), is controlled by the digital codewords based on an input signal to turn on and off the power cells inside the I-PA or the Q-PA...
The wireless communication in the Unmanned Aerial Vehicle (UAV) data link faces serious multi path fading, which leads to frequency-selective fading and inter-symbol interference and affects the quality of data transmission. Single Carrier Frequency Domain Equalization (SC-FDE) is an effective method to mitigate the influence of multipath fading. Frame structure is essential in wireless communication...
OFDM system performance is sensitive to frequency offset and timing error than single-carried system. In this paper, a novel joint time and frequency synchronization method is proposed based on PN sequences for OFDM. A special training symbol of OFDM is constructed with the PN sequence and the differentially coded PN sequence in the transmitter, in the receiver, the training symbol is differentially...
Differential turbo coded OFDM(DTC-OFDM) scheme was presented, together with a differential soft-detection method for Ka-band satellite communications. DTC-OFDM combines Turbo codes, orthogonal frequency division multiplexing (OFDM) modulation and differential detection, which has the advantages of high spectrum efficiency and suppression of multipath fading, jamming and noise. The DTC-OFDM system...
An OFDM system optimization for satellite communication in Ka band is estimated in terms of the Shannon theory. The analysis covers a novel closed-form expression for the optimal subcarriers, with respect to the maximization of the achieved spectral efficiency, expressed in terms of the theoretically Shannon channel capacity available to each system's user.
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